Shutter for motion-picture machines



TES

UNITED SITA PATENT OFFICE ARTHURM. rA'rUREAU, or BnAUMoN'r, TEXAS.'

SHUTTER FOR MOTION-PICTURE MACHINES.

i Specification of Letters Patent.

`Patented Aug. 22, 1922.

Application filed August 18, 1921. Serial No. 493,406.

tain new and useful Improvements in` Shutters k:for Motion-PictureMachines, of

i which the following is a specification.

This invention relates to an improved shutter for motion picturemachines and has as one of its principal objects to provide a device ofthis character which will `eliminate flickering.

The invention has afurther object to provide a shutter constructed topermit the passage of a portion of the light therethrough during theperiod of occultation to thus avoid the sharp contrast which wouldotherwise occur between full illumination of the screen and totaldarkening thereof.

And the invention has as a still further object to provide a shutter` soconstructed that the light rays will be uninterrupted in minimumduration consistent with a complete obscuration of the effect producedby shift- `infr of the lm. i y

@ther and incidental objects will appear y opening therethrough andprovided with small holes near said opening to accommodate fasteningdevices securing a hub to the shutter, a hub being employed, of course,for mounting the shutter upon the drive shaft. of the present inventionit has not been illustrated. Extending radially from the por- Y tion 1()of the shutter at one side thereof is a segmental blade 11 in which isformed a plurality of radially disposed rows of relatively small holes12. Five rows of these holes are preferably employed and, as will benoted, there are four holes in Since the hub forms no partr each row,making a total of twenty openings, corresponding holes of the rowsbelng, in each instance, disposed on an arc concentric to the axis ofthe shutter. Extending radially from the central portion 10 of theshutter at its opposite side are spaced Iblades 13 and connecting all ofthe blades is a rim 14 integral with said blades.

It is now to be noted that the blades 13 `are of equal area and areseparated by any total kdarkening of the screen will be avoided. At thesame time, the eii'ect produced by shifting the film'will be completelyobscured. `The blades 13 are provided `to intercept the light raysduring the period of illumination so as to counterbalance the effectproduced by the interception of the light rays by the blade 11. As aresult, sharp contrasts in the lighting of the screen are avoided andflickering is eliminated. As will be observed, relatively large openingsare provided betweenv the blade 1l and each of the blades 13 while, aspreviously stated, between the blades 13 is an opening corresponding inarea to the area ofveach of said blades. Accordingly, the screen will befully illuminated for a major portion of the time for producing a brightsharp picture.

Havm thus described `the invention, what is c aimed as new is:

A shutter of the character described consisting of a centraloircularportion, a blade extending from'one side of said centralcircular ortion and provided with perforations theret rough arranged inrows on radial lines land concentric arcs, equally spaced imperforateblades extending from the censpaces of greater area than any of theblades, and a rim connecting the outer edges of all the blades. l0

1n testimony whereof I affix my signature.

` ARTHUR M. PATUREAU.

